Data loading strategy
Ordinary loading model is generally used, because of the small amount of data. Multilevel loading model
is the premise of the hierarchical network. When the system is initialized, it only presents the uppermost data.
The multilevel loading model can not only save space, but also improve the speed of loading system.
In general, NTM will be developed in the intelligent and hierarchical direction in the future[8]. In the
whole life cycle, the most difficult is analyzing topological data, and the large amount of work is database
construction, graphic processing and external interfaces.